#include <iostream>

using namespace std;

class Cube {
    //屬性
private:
    //長
    double length;
    //高
    double height;
    //寬
    double width;

    //行為
public:
    //設定長
    void setLength(double length) {
        this->length = length;
    }

    //獲取長
    double getLength() {
        return
 
 length;
    }

    //設定高
    void setHeight(double height) {
        this->height = height;
    }

    //獲取高
    double getHeight() {
        return height;
    }

    //設定寬
    void setWidth(double width) {
        this->width = width;
    }

    //獲取寬
    double getWidth() {
        return width;
    }

    
 
/**
     * 計算表面積
     * surface n.表面;外觀;表層;v.浮出水面;使成平面;adj.表面的
     * surface/surfacial area 表面積
     * @return
     */
    double calculateSurfaceArea() {
        return length * (width + height) * 2 + width * height * 2;
    }

    /**
    * 計算立方體的體積
    * volume n.體積;量;音量;adj.大量的
    * @return
    */
    double
 
 calculateVolume() {
        return length * width * height;
    }

    /**
     * 比較體積是否相等
     * @param c 欲比較的立方體Cube物件
     * @return  比較結果
     */
    bool equalsVolume(Cube& c) {
        return calculateVolume() == c.calculateVolume();
    }
};

bool equalsVolume(Cube& c1,Cube& c2) {
    return c1.calculateVolume() == c2.calculateVolume();
}

int main() {
    Cube c1;
    c1.setLength(2.5);
    c1.setWidth(7.5);
    c1.setHeight(4);
    cout << "Cube c1's volume is " << c1.calculateVolume() << endl;
    cout << "Cube c1's surface area is " << c1.calculateSurfaceArea() << endl;

    Cube c2;
    c2.setLength(5);
    c2.setWidth(3);
    c2.setHeight(5);

    cout << "Is the volume of Cube c1 is equals to the volume of Cube c2 ?" << (c1.equalsVolume(c2) ? "yes" : "no") << endl;
    cout << "Is the volume of Cube c1 is equals to the volume of Cube c2 ?" << (equalsVolume(c1, c2) ? "yes" : "no") << endl;

    system("pause");
    return 0;
}